alfred Aug 29, 2019 @ 10:43am
Reinstalling games from steam backups.
I uninstalled a game because of problems, and thought I could cut down load times by using my Steam backup to restore it from. It turned out I had to wait 3 hours because although it said restore, it actually downloaded it from the net. What is the point of saving backups if you can’t reinstall from them. Have I got something wrong perhaps as I went through the restore feature.
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Showing 1-15 of 25 comments
nullable Aug 29, 2019 @ 3:30pm 
Well you didn't mention what game. And I've used the backup feature in days bygone (you don't really need to now). So flukey-fluke or PEBKAC, you decide!
SenMithrarin85 Aug 29, 2019 @ 6:55pm 
steam has a tendency that for reasons known only to itself, it will occasionally ignore existing files or backups and start downloading the full game regardless. like everything valve does, its more trouble than its worth.
alfred Aug 30, 2019 @ 2:32am 
The game was Assassins Creed Odyssey and the free DLC caused the problem.
8ullfrog Aug 30, 2019 @ 2:39am 
Steam seems to prefer grabbing fresh over restoring backups, I've had it flat out refuse to restore one.
McGillicutti Aug 30, 2019 @ 7:19am 
Sounds like something got corrupted in the files before you backed them up, and when you tried to restore the verification indicated they had been corrupted so Steam as a service to secure your library and make sure you have your game in a playable condition, downloaded a fresh copy.

It happens every time it finds a bad file when you do a verification of the files too. But it's not for some heinous purpose even if it is, agreeably, a PITA and highly inconvenient. Data corruption is more common with larger and larger data transmissions and encryption/token methods too today.
8ullfrog Aug 30, 2019 @ 7:24am 
Nope, it just wanted the later version. It was a lateral move to a new machine, backup had already been tested.

I used to burn them to DVD. Now it makes more sense to dump the entire directory onto a USB stick.
McGillicutti Aug 30, 2019 @ 7:30am 
Well it's a binary that triggers the move to download, essentially. So something was corrupt in the file. Whatever test was done may have missed the error as well, it depends on the extent of system corruption. I've made a parameter setting change to some aspect of my system that disabled something that was corrupted, and then my virus software is going off because now the piece that was being used to mask detection was no longer enabled. You may well have done something similar between the time when you made the backup and verified it, and when you tried to restore it. I know Steam didn't just assume it would be an inconvenience and download a fresh copy so you could feel inconvenienced. There was a reason behind Steam downloading a fresh copy, and it was in yours and Steam's best interest since you bought the game from Steam right? That's all I am saying.
8ullfrog Aug 30, 2019 @ 7:36am 
Look, I get you really like this narrative, but I had previously restored that exact backup. It wasn't corrupt, they'd just released a later version.

If you use a USB stick and grab the entire directory, you don't have to download the new version, it just works.
Kargor Aug 30, 2019 @ 7:40am 
Originally posted by McGillicutti:
Sounds like something got corrupted in the files before you backed them up...

I've been wondering about this for years: whenever someone has a problem, someone inevitably shows up and tells him that files got corrupted, and he should "verify local files" and stuff.

Where exactly do you guys get this idea? Files don't just randomly go bad; even if the disk goes bad, chances are that it will actually be flagged as an error because the error detection is designed to not get fooled easily. And Steam, like every other software, probably doesn't just ignore errors when reading files.
McGillicutti Aug 30, 2019 @ 8:57am 
Originally posted by Kargor:
Originally posted by McGillicutti:
Sounds like something got corrupted in the files before you backed them up...

I've been wondering about this for years: whenever someone has a problem, someone inevitably shows up and tells him that files got corrupted, and he should "verify local files" and stuff.

Where exactly do you guys get this idea? Files don't just randomly go bad; even if the disk goes bad, chances are that it will actually be flagged as an error because the error detection is designed to not get fooled easily. And Steam, like every other software, probably doesn't just ignore errors when reading files.

Since you asked...

Google iteration yourself and you'll see more, far more, these are just examples:

https://www.sciencedirect.com/science/article/pii/S0893965919301429

https://www.cengage.com/resource_uploads/downloads/0840069421_258759.pdf

https://www3.nd.edu/~zxu2/acms40390F12/Lec-7.3.pdf << Note this last one is www3 meaning it effects the web.

The fact there are so many competing Ph.d models to create accurate math, and that these are implemented in how the circuitry functions since these are also customers for computing, explains by its existence that there is a constant of error, some amount of error, and a constant of finding a way to fix it.

When I was much younger we had some calculation we punched into calculators, I believe it was (9 x 7), then /7, then /3, then /3 again, the answer was supposed to be 1, 8 of 10 would give some numerical .11111+E answer or something to that effect, and it was suggested, at the time, that engineers use this calculation to determine the right calculator to buy, or not.

These same algorithms, and more complicated, with a lot of theory like noted in the previous links, is incorporated in our Operating Systems, Our CPUs, Our GPUs, and as the www3 link indicates above, the entire web by the shear constant consideration and effort upon it.

Note here in the following link how the question many asked was whether it's a double precision CPU or not, and then explain how errors can "accumulate," https://devtalk.nvidia.com/default/topic/622302/cpu-and-gpu-floating-point-anomaly-/


If you look you'll find that no 2 computers identical in lot and model of its entire hardware and software run identically, differences in how the silicon took to the dye, paste application, subtleties we assume of no consequence have an effect, and the longer we "bake" the system by use, the more we reinforce these differences.

Data on a system that's being regularly updated, and where error can occur from any number of areas, intentional and unintentional, acts of nature, eddy currents, are all factors that can lead to data integrity loss and/or corruption.

I am just trying to be helpful because when something goes wrong and you don't know why it forces the question.


As to the USB stick, please consider that different parts of the Operating System are invoked to write & to manage a USB stick versus the Hard Drive or SSD for that matter, the interface creates the difference, and that actually may be giving you a clue as to either the driver for the hard drive and/or SSD or some hardware component related to it is not functioning properly for some reason (corrupted in some way, misconfigured, etc.), and yes it could be Steam too and sure they need a ticket about this, to rule that out or get it fixed. So it's good you did it from the USB as that rules out that it's a deeper component of the operating system itself and may also rule out Steam if Steam treats all devices the same, and would point directly to the driver or a driver conflict of some sort.

Just some ideas, again, trying to help.
Last edited by McGillicutti; Aug 30, 2019 @ 9:00am
8ullfrog Aug 30, 2019 @ 9:09am 
Oh, I'll just hire a necromancer to handle the invocations.
alfred Aug 30, 2019 @ 2:13pm 
I deleted all my Steam backups after trying an uninstall on a small game then trying to restore from Steam backups. It did exactly the same ignored the restore and downloaded again. I then followed Bullfrogs method backed up a game without Steams help. It was a bigger file, but when I placed it in the Steam common folder it reinstalled in minutes using the backup. The backing up was quicker by far than Steams method.
8ullfrog Aug 30, 2019 @ 8:13pm 
Yeah, I really hope they fix that and the stupid pre-allocation thing in the next release, but I understand it's probably just a facelift for the library.

I had the retail GOTY FO3, I did the directory drop thing when I got it on steam, exact same files. I think it replaced the executable and that was around 3 mb?

Steam backups are just busted.
Last edited by 8ullfrog; Aug 30, 2019 @ 8:14pm
McGillicutti Aug 30, 2019 @ 8:28pm 
Originally posted by 8ullfrog:
Yeah, I really hope they fix that and the stupid pre-allocation thing in the next release, but I understand it's probably just a facelift for the library.

I had the retail GOTY FO3, I did the directory drop thing when I got it on steam, exact same files. I think it replaced the executable and that was around 3 mb?

Steam backups are just busted.

Start a reddit and maybe even a crowdfund to be donated to Steam, doesn't have to be all that much but to make the point, to help afford fixing these things, and if not fix them find why they are messed up. Just a suggestion if you really just want it fixed.
Last edited by McGillicutti; Aug 30, 2019 @ 8:29pm
8ullfrog Aug 30, 2019 @ 8:31pm 
uh, no, that sounds like something the reddit people would disembowel someone over.
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Date Posted: Aug 29, 2019 @ 10:43am
Posts: 25